US20110234128A1 - Power supply circuit and motor device - Google Patents
Power supply circuit and motor device Download PDFInfo
- Publication number
- US20110234128A1 US20110234128A1 US13/072,178 US201113072178A US2011234128A1 US 20110234128 A1 US20110234128 A1 US 20110234128A1 US 201113072178 A US201113072178 A US 201113072178A US 2011234128 A1 US2011234128 A1 US 2011234128A1
- Authority
- US
- United States
- Prior art keywords
- power supply
- voltage
- unit
- electrically connected
- supply circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/06—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using impedances
- H02M5/08—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using impedances using capacitors only
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the invention relates to a power supply circuit which is particularly suitable for powering an electric motor and to a motor device incorporating same.
- a driver for a BLDC motor usually includes a voltage decreasing unit for decreasing AC mains voltage, a rectifier for rectifying the decreased AC voltage to a DC voltage, and an inverter which is powered by the DC voltage and commutates the power supplied to the BLDC motor.
- the speed of the motor can be adjusted by changing the PWM signal provided to the inverter.
- the present invention aims to provide a new power supply circuit which is particularly suitable for a variable speed electric motor powered by an AC mains power supply.
- the present invention provides a power supply circuit comprising an input terminal for electrically connecting to an active wire of an AC power supply, an earth terminal for electrically connecting to a neutral or ground wire of the AC power supply, and a voltage decreasing unit, wherein the voltage decreasing unit comprises: an adjustable capacitor unit with adjustable capacitance for decreasing an AC voltage applied to the input terminal; and an output terminal for outputting the decreased AC voltage.
- the adjustable capacitor unit is electrically connected between the input terminal and the output terminal.
- the voltage decreasing unit further comprises a fixed capacitor electrically connected between the output terminal and the earth terminal.
- the adjustable capacitor unit is electrically connected between the output terminal and the earth terminal, and the voltage decreasing unit further comprises a fixed capacitor electrically connected between the input terminal and the output terminal.
- the voltage decreasing unit comprises a first adjustable capacitor unit electrically connected between the input terminal and the output terminal and a second adjustable capacitor unit electrically connected between the output terminal and the earth terminal.
- the adjustable capacitor unit comprises at least two fixed capacitors and a control unit for respectively and controllably electrically connecting the at least two fixed capacitors between the input terminal and the output terminal.
- the adjustable capacitor unit comprises at least one switching capacitor which comprises a fixed capacitor and a switch electrically connected in series with the fixed capacitor.
- the adjustable capacitor unit comprises at least two switching capacitors which are electrically connected in parallel with each other.
- each switching capacitor further comprises a resistor electrically connected in series with the fixed capacitor.
- the voltage decreasing unit further comprises a resistor electrically connected in parallel with the adjustable capacitor unit.
- the voltage decreasing unit further comprises a resistor and/or an inductor electrically connected in series with the adjustable capacitor unit.
- the present invention provides a motor device comprising a motor and a power supply circuit for powering the motor, wherein the power supply circuit is as described above.
- the motor is a DC motor
- the power supply circuit further comprises an A-D converter for converting the decreased AC voltage of the output terminal to a DC voltage.
- the A-D converter is arranged on a printed circuit board, and the voltage decreasing unit is electrically connected with the printed circuit board but mechanically independent from the printed circuit board.
- the motor is an AC motor powered by the decreased AC voltage from the output terminal.
- the voltage output from the voltage decreasing unit can be adjusted to change the speed of the motor. Meanwhile, the circuit of the motor driver is simple and the cost is reduced.
- FIG. 1 is a block diagram of a motor device in accordance with a first embodiment of the present invention
- FIG. 2 is a schematic diagram of a voltage decreasing unit of the motor device of FIG. 1 ;
- FIG. 3 shows a high frequency pulse signal output from a mechanical switch between an AC power supply and the voltage decreasing unit
- FIGS. 4 to 10 respectively show voltage decreasing units according to further embodiments of the present invention.
- a motor device 200 is powered by an alternating current (AC) power supply 206 and comprises a motor and a power supply circuit for supplying power to the motor.
- the power supply circuit comprises an input terminal 201 for connecting a live or active wire of the AC power supply 206 , an earth terminal 202 for connecting a neutral or ground wire of the AC power supply 206 , a voltage decreasing unit 220 , and an A-D converter 240 .
- the motor is a brushless direct current (BLDC) motor having a rotor and a stator with a stator winding 208 .
- BLDC brushless direct current
- the voltage decreasing unit 220 comprises an adjustable capacitor unit 222 ( FIG. 2 ) with adjustable capacitance for decreasing the AC voltage supplied to the input terminal 201 and the earth terminal 202 .
- the decreased voltage is applied to an output terminal 203 of the voltage decreasing unit.
- the adjustable capacitor unit 222 is electrically connected between the input terminal 201 and the output terminal 203 and comprises at least two fixed capacitors 228 with fixed capacitance and a control unit 226 for controlling connection of the at least two fixed capacitors 228 between the input terminal 201 and the output terminal 203 .
- the control unit 226 comprises at least two switches 221 which are respectively electrically connected in series with the at least two fixed capacitors 228 .
- Each switch 221 and a corresponding capacitor 228 form a switching capacitor and the at least two switching capacitors are electrically connected in parallel with each other.
- a switch 221 When a switch 221 is conductive, its corresponding capacitor 228 is electrically connected between the input terminal 201 and the output terminal 203 , in effect connecting the power supply to the output terminal 203 .
- a switch 221 When a switch 221 is non-conductive or open circuited, its corresponding capacitor 228 is electrically disconnected from the circuit. Therefore, by controlling the states of the respective switches 221 , the fixed capacitors 228 can be electrically connected or disconnected from the circuit so that the capacitance of the adjustable capacitor unit 222 can be adjusted, thereby adjusting the output voltage of the voltage decreasing unit.
- the A-D converter 240 comprises a rectifier 242 for converting the decreased AC voltage at the output terminal 203 to a DC voltage and a filter 244 for smoothing the DC voltage output from the rectifier 242 .
- the rectifier 242 is a bridge rectifier and the filter 244 is a capacitor electrically connected across the output terminals of the bridge rectifier.
- a D-D converter powered by the DC voltage output from the A-D converter 240 can also be arranged in the motor device 200 .
- the D-D converter is a low-voltage generating unit 280 for generating a stable lower DC voltage from the higher DC voltage output from the A-D converter 240 .
- the low-voltage generating unit 280 comprises a resistor and a Zener diode. One end of the resistor is electrically connected with the positive output terminal of the bridge rectifier, the other end is electrically connected with the cathode of the Zener diode, and the anode of the Zener diode is electrically connected with the ground.
- a filtering capacitor electrically connected in parallel with the Zener diode may be arranged in the low-voltage generating unit 280 so as to output a stable lower DC voltage at the cathode of the Zener diode.
- the motor device 200 further includes a driving unit 260 which comprises a position detecting unit 262 , a controller 264 and an inverter 266 .
- the position detecting unit 262 may be a Hall sensor which is powered by the lower DC voltage and arranged to detect the position of the rotor of the BLDC motor and output a corresponding position signal.
- the controller 264 is configured to respond to the position signal and output a corresponding commutating signal.
- the controller 264 can be realized by a microcontroller or by a switching circuit constituted by electronic components such as resistor and switch.
- the inverter 266 is powered by the DC voltage output from the A-D converter 240 and is configured to respond to the commutating signal to supply power to the stator windings 208 of the motor.
- the motor device 200 further includes a voltage adjusting unit for adjusting the DC voltage output from the A-D converter 240 .
- the voltage adjusting unit is an over-voltage protection unit 290 arranged to limit the maximum voltage output from the A-D converter 240 to prevent electronic components powered by the DC voltage from damage.
- the circuit cost could be lowered.
- the A-D converter 240 can correspondingly output DC voltage with different values so as to operate the motor at different speeds. If the adjustable capacitor unit 222 has n fixed capacitors 228 which have different capacitances from one another, up to 2 n ⁇ 4 different speeds can be provided.
- a mechanical switch may be provided for connecting the AC power supply 206 to the input terminal.
- the mechanical switch is prone to bouncing thereby outputting a high frequency pulse signal as shown in FIG. 3 .
- the capacitor 228 in the adjustable capacitor unit 222 is equivalent to a short circuit path, which results in a surge current passing through the capacitor and the following electronic components.
- a voltage decreasing unit 220 in accordance with a second embodiment as shown in FIG.
- the voltage decreasing unit 220 could include any one, any two or all three of the resistors R 1 , R 2 and the inductor L, depending on practical requirements.
- a voltage decreasing unit 220 in accordance with a third embodiment further comprises a capacitor C 1 electrically connected between the output terminal 203 and the earth terminal 202 .
- a respective resistor R 3 is electrically connected in series with each fixed capacitor 228 such that each switching capacitor has its own resistor R 3 to limit the possible surge current and make the output of the voltage decreasing unit 220 more accurate. It should be understood that discharging resistor R 1 electrically connected in parallel with the adjustable capacitor unit 222 and/or inductor L electrically connected in series with the adjustable capacitor unit 222 can also be arranged, depending on practical requirements.
- a voltage decreasing unit 220 in accordance with a fifth embodiment comprises a first adjustable capacitor unit 222 ′ which is electrically connected between the input terminal 201 and the output terminal 203 and a second adjustable capacitor unit 224 ′ which is electrically connected between the output terminal 203 and the earth terminal 202 .
- Each of the first and second adjustable capacitor units 222 ′, 224 ′ comprises at least one switching capacitor.
- the voltage decreasing unit 220 in accordance with a sixth embodiment, as shown in FIG. 8 , further comprises a resistor R 1 which is electrically connected in parallel with the first adjustable capacitor unit 222 ′ for discharging the adjustable capacitor unit after the AC power supply 206 is electrically disconnected from the voltage decreasing unit.
- a resistor R 2 and an inductor L are electrically connected in series with the first adjustable capacitor unit 222 ′ for limiting the possible surge current to protect electronic components from damage. It should be understood that in different applications the voltage decreasing unit 220 could include any one, any two or all three of the resistors R 1 , R 2 and the inductor L, depending on practical requirements.
- a resistor R 3 is respectively electrically connected in series with each fixed capacitor 228 of the first adjustable capacitor unit 222 ′ and/or second adjustable capacitor unit 224 ′, to limit the possible surge current and make the output of the voltage decreasing unit 220 more accurate. It should be understood that a resistor R 1 electrically connected in parallel with the first adjustable capacitor unit 222 ′ and/or an inductor L electrically connected in series with the first adjustable capacitor unit 222 ′ could also be arranged in the voltage decreasing unit, depending on practical requirements.
- the voltage decreasing unit 220 comprises a fixed capacitor C 2 electrically connected between the input terminal 201 and the output terminal 202 and an adjustable capacitor unit 224 electrically connected between the output terminal 203 and the earth terminal 202 .
- the adjustable capacitor unit 224 comprises at least one switching capacitor with a fixed capacitor 228 and a switch 221 .
- a single resistor electrically connected in series with the switch 221 or a number of resistors respectively connected in series with each switching capacitor can be arranged.
- the A-D converter 240 , the driving unit 260 , the over-voltage protection unit 290 and the low voltage generating unit 280 can be arranged on a printed circuit board, and the adjustable capacitor unit can be mechanically independent from the printed circuit board but electrically connected with the printed circuit board.
- the motor device is particularly suitable for driving fans of ventilating devices, air blowers and air conditioners.
- the motor could be another kind of DC motor such as a two phase or three phase BLDC motor, a universal motor, a stepper motor, a servo motor or an AC motor, such as a shaded-pole motor, induction motor or universal motor, which is able to be directly powered by the decreased AC voltage output from the voltage decreasing unit.
- DC motor such as a two phase or three phase BLDC motor, a universal motor, a stepper motor, a servo motor or an AC motor, such as a shaded-pole motor, induction motor or universal motor, which is able to be directly powered by the decreased AC voltage output from the voltage decreasing unit.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Ac Motors In General (AREA)
- Rectifiers (AREA)
- Inverter Devices (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
- This non-provisional patent application claims priority under 35 U.S.C. §119(a) from Patent Application No. 201010138043.8 filed in The People's Republic of China on Mar. 26, 2010 and Patent Application No. 201010270600.1 filed in The People's Republic of China on Aug. 24, 2010.
- The invention relates to a power supply circuit which is particularly suitable for powering an electric motor and to a motor device incorporating same.
- A driver for a BLDC motor usually includes a voltage decreasing unit for decreasing AC mains voltage, a rectifier for rectifying the decreased AC voltage to a DC voltage, and an inverter which is powered by the DC voltage and commutates the power supplied to the BLDC motor. In prior art drivers, the speed of the motor can be adjusted by changing the PWM signal provided to the inverter.
- The present invention aims to provide a new power supply circuit which is particularly suitable for a variable speed electric motor powered by an AC mains power supply.
- Accordingly, in one aspect thereof, the present invention provides a power supply circuit comprising an input terminal for electrically connecting to an active wire of an AC power supply, an earth terminal for electrically connecting to a neutral or ground wire of the AC power supply, and a voltage decreasing unit, wherein the voltage decreasing unit comprises: an adjustable capacitor unit with adjustable capacitance for decreasing an AC voltage applied to the input terminal; and an output terminal for outputting the decreased AC voltage.
- Preferably, the adjustable capacitor unit is electrically connected between the input terminal and the output terminal.
- Preferably, the voltage decreasing unit further comprises a fixed capacitor electrically connected between the output terminal and the earth terminal.
- Alternatively, the adjustable capacitor unit is electrically connected between the output terminal and the earth terminal, and the voltage decreasing unit further comprises a fixed capacitor electrically connected between the input terminal and the output terminal.
- Preferably, the voltage decreasing unit comprises a first adjustable capacitor unit electrically connected between the input terminal and the output terminal and a second adjustable capacitor unit electrically connected between the output terminal and the earth terminal.
- Preferably, the adjustable capacitor unit comprises at least two fixed capacitors and a control unit for respectively and controllably electrically connecting the at least two fixed capacitors between the input terminal and the output terminal.
- Preferably, the adjustable capacitor unit comprises at least one switching capacitor which comprises a fixed capacitor and a switch electrically connected in series with the fixed capacitor.
- Preferably, the adjustable capacitor unit comprises at least two switching capacitors which are electrically connected in parallel with each other.
- Optionally, each switching capacitor further comprises a resistor electrically connected in series with the fixed capacitor.
- Preferably, the voltage decreasing unit further comprises a resistor electrically connected in parallel with the adjustable capacitor unit.
- Preferably, the voltage decreasing unit further comprises a resistor and/or an inductor electrically connected in series with the adjustable capacitor unit.
- According to a second aspect, the present invention provides a motor device comprising a motor and a power supply circuit for powering the motor, wherein the power supply circuit is as described above.
- Preferably, the motor is a DC motor, and the power supply circuit further comprises an A-D converter for converting the decreased AC voltage of the output terminal to a DC voltage.
- Preferably, the A-D converter is arranged on a printed circuit board, and the voltage decreasing unit is electrically connected with the printed circuit board but mechanically independent from the printed circuit board.
- Alternatively, the motor is an AC motor powered by the decreased AC voltage from the output terminal.
- In the embodiments of the present invention, by adjusting the capacitance of the adjustable capacitor unit, the voltage output from the voltage decreasing unit can be adjusted to change the speed of the motor. Meanwhile, the circuit of the motor driver is simple and the cost is reduced.
- Preferred embodiments of the invention will now be described, by way of example only, with reference to figures of the accompanying drawings. In the figures, identical structures, elements or parts that appear in more than one figure are generally labeled with a same reference numeral in all the figures in which they appear. Dimensions of components and features shown in the figures are generally chosen for convenience and clarity of presentation and are not necessarily shown to scale. The figures are listed below.
-
FIG. 1 is a block diagram of a motor device in accordance with a first embodiment of the present invention; -
FIG. 2 is a schematic diagram of a voltage decreasing unit of the motor device ofFIG. 1 ; -
FIG. 3 shows a high frequency pulse signal output from a mechanical switch between an AC power supply and the voltage decreasing unit; and -
FIGS. 4 to 10 respectively show voltage decreasing units according to further embodiments of the present invention. - Referring to
FIGS. 1 and 2 , amotor device 200 according to the preferred embodiment of the present invention is powered by an alternating current (AC)power supply 206 and comprises a motor and a power supply circuit for supplying power to the motor. The power supply circuit comprises aninput terminal 201 for connecting a live or active wire of theAC power supply 206, anearth terminal 202 for connecting a neutral or ground wire of theAC power supply 206, avoltage decreasing unit 220, and anA-D converter 240. In this embodiment, the motor is a brushless direct current (BLDC) motor having a rotor and a stator with a stator winding 208. - The
voltage decreasing unit 220 comprises an adjustable capacitor unit 222 (FIG. 2 ) with adjustable capacitance for decreasing the AC voltage supplied to theinput terminal 201 and theearth terminal 202. The decreased voltage is applied to anoutput terminal 203 of the voltage decreasing unit. Theadjustable capacitor unit 222 is electrically connected between theinput terminal 201 and theoutput terminal 203 and comprises at least twofixed capacitors 228 with fixed capacitance and acontrol unit 226 for controlling connection of the at least twofixed capacitors 228 between theinput terminal 201 and theoutput terminal 203. Thecontrol unit 226 comprises at least twoswitches 221 which are respectively electrically connected in series with the at least twofixed capacitors 228. Eachswitch 221 and acorresponding capacitor 228 form a switching capacitor and the at least two switching capacitors are electrically connected in parallel with each other. When aswitch 221 is conductive, itscorresponding capacitor 228 is electrically connected between theinput terminal 201 and theoutput terminal 203, in effect connecting the power supply to theoutput terminal 203. When aswitch 221 is non-conductive or open circuited, itscorresponding capacitor 228 is electrically disconnected from the circuit. Therefore, by controlling the states of therespective switches 221, thefixed capacitors 228 can be electrically connected or disconnected from the circuit so that the capacitance of theadjustable capacitor unit 222 can be adjusted, thereby adjusting the output voltage of the voltage decreasing unit. - The
A-D converter 240 comprises arectifier 242 for converting the decreased AC voltage at theoutput terminal 203 to a DC voltage and afilter 244 for smoothing the DC voltage output from therectifier 242. In the preferred embodiment, therectifier 242 is a bridge rectifier and thefilter 244 is a capacitor electrically connected across the output terminals of the bridge rectifier. - A D-D converter powered by the DC voltage output from the
A-D converter 240 can also be arranged in themotor device 200. In the embodiment, the D-D converter is a low-voltage generating unit 280 for generating a stable lower DC voltage from the higher DC voltage output from theA-D converter 240. The low-voltage generating unit 280 comprises a resistor and a Zener diode. One end of the resistor is electrically connected with the positive output terminal of the bridge rectifier, the other end is electrically connected with the cathode of the Zener diode, and the anode of the Zener diode is electrically connected with the ground. Optionally, a filtering capacitor electrically connected in parallel with the Zener diode may be arranged in the low-voltage generating unit 280 so as to output a stable lower DC voltage at the cathode of the Zener diode. - The
motor device 200 further includes adriving unit 260 which comprises aposition detecting unit 262, acontroller 264 and aninverter 266. Theposition detecting unit 262 may be a Hall sensor which is powered by the lower DC voltage and arranged to detect the position of the rotor of the BLDC motor and output a corresponding position signal. Thecontroller 264 is configured to respond to the position signal and output a corresponding commutating signal. Thecontroller 264 can be realized by a microcontroller or by a switching circuit constituted by electronic components such as resistor and switch. Theinverter 266 is powered by the DC voltage output from theA-D converter 240 and is configured to respond to the commutating signal to supply power to thestator windings 208 of the motor. - In addition, the
motor device 200 further includes a voltage adjusting unit for adjusting the DC voltage output from theA-D converter 240. In the preferred embodiment, the voltage adjusting unit is an over-voltageprotection unit 290 arranged to limit the maximum voltage output from theA-D converter 240 to prevent electronic components powered by the DC voltage from damage. Besides, as electronic components with a relatively lower voltage-resistant grade could be used in the circuit powered by the AC voltage output from the voltage decreasing unit, the circuit cost could be lowered. - In the embodiments of the present invention, by controlling the
adjustable capacitor unit 222 with different capacitances, theA-D converter 240 can correspondingly output DC voltage with different values so as to operate the motor at different speeds. If theadjustable capacitor unit 222 has nfixed capacitors 228 which have different capacitances from one another, up to 2n −4 different speeds can be provided. - In practical applications, a mechanical switch may be provided for connecting the
AC power supply 206 to the input terminal. During switching, the mechanical switch is prone to bouncing thereby outputting a high frequency pulse signal as shown inFIG. 3 . At this time, thecapacitor 228 in theadjustable capacitor unit 222 is equivalent to a short circuit path, which results in a surge current passing through the capacitor and the following electronic components. To solve this problem, compared with thevoltage decreasing unit 220 ofFIG. 2 , avoltage decreasing unit 220, in accordance with a second embodiment as shown inFIG. 4 , further comprises a resistor R2 and an inductor L which are electrically connected in series with theadjustable capacitor unit 222 to limit the possible surge current to prevent the electronic components from damage and a resistor R1 which is electrically connected in parallel with theadjustable capacitor unit 222 for discharging theadjustable capacitor unit 222 after the AC power supply is disconnected from the power supply circuit. It should be understood that in different applications thevoltage decreasing unit 220 could include any one, any two or all three of the resistors R1, R2 and the inductor L, depending on practical requirements. - Compared with the
voltage decreasing unit 220 shown inFIG. 2 , avoltage decreasing unit 220 in accordance with a third embodiment, as shown inFIG. 5 , further comprises a capacitor C1 electrically connected between theoutput terminal 203 and theearth terminal 202. - Compared with the
voltage decreasing unit 220 shown inFIG. 2 , in avoltage decreasing unit 220 in accordance with a fourth embodiment, as shown inFIG. 6 , a respective resistor R3 is electrically connected in series with each fixedcapacitor 228 such that each switching capacitor has its own resistor R3 to limit the possible surge current and make the output of thevoltage decreasing unit 220 more accurate. It should be understood that discharging resistor R1 electrically connected in parallel with theadjustable capacitor unit 222 and/or inductor L electrically connected in series with theadjustable capacitor unit 222 can also be arranged, depending on practical requirements. - Referring to
FIG. 7 , avoltage decreasing unit 220 in accordance with a fifth embodiment comprises a firstadjustable capacitor unit 222′ which is electrically connected between theinput terminal 201 and theoutput terminal 203 and a secondadjustable capacitor unit 224′ which is electrically connected between theoutput terminal 203 and theearth terminal 202. Each of the first and secondadjustable capacitor units 222′, 224′ comprises at least one switching capacitor. - Compared with the voltage decreasing unit shown in
FIG. 7 , thevoltage decreasing unit 220 in accordance with a sixth embodiment, as shown inFIG. 8 , further comprises a resistor R1 which is electrically connected in parallel with the firstadjustable capacitor unit 222′ for discharging the adjustable capacitor unit after theAC power supply 206 is electrically disconnected from the voltage decreasing unit. A resistor R2 and an inductor L are electrically connected in series with the firstadjustable capacitor unit 222′ for limiting the possible surge current to protect electronic components from damage. It should be understood that in different applications thevoltage decreasing unit 220 could include any one, any two or all three of the resistors R1, R2 and the inductor L, depending on practical requirements. - Compared with the voltage decreasing unit shown in
FIG. 7 , in a seventh embodiment shown inFIG. 9 , a resistor R3 is respectively electrically connected in series with each fixedcapacitor 228 of the firstadjustable capacitor unit 222′ and/or secondadjustable capacitor unit 224′, to limit the possible surge current and make the output of thevoltage decreasing unit 220 more accurate. It should be understood that a resistor R1 electrically connected in parallel with the firstadjustable capacitor unit 222′ and/or an inductor L electrically connected in series with the firstadjustable capacitor unit 222′ could also be arranged in the voltage decreasing unit, depending on practical requirements. - Referring to
FIG. 10 , in an eighth embodiment of the present invention, thevoltage decreasing unit 220 comprises a fixed capacitor C2 electrically connected between theinput terminal 201 and theoutput terminal 202 and anadjustable capacitor unit 224 electrically connected between theoutput terminal 203 and theearth terminal 202. Theadjustable capacitor unit 224 comprises at least one switching capacitor with a fixedcapacitor 228 and aswitch 221. Preferably, a single resistor electrically connected in series with theswitch 221 or a number of resistors respectively connected in series with each switching capacitor can be arranged. - In the embodiments of the present invention, the
A-D converter 240, the drivingunit 260, theover-voltage protection unit 290 and the lowvoltage generating unit 280 can be arranged on a printed circuit board, and the adjustable capacitor unit can be mechanically independent from the printed circuit board but electrically connected with the printed circuit board. - The motor device is particularly suitable for driving fans of ventilating devices, air blowers and air conditioners.
- Although the invention is described with reference to one or more preferred embodiments, it should be appreciated by those skilled in the art that various modifications are possible. Therefore, the scope of the invention is to be determined by reference to the claims that follow.
- For example, the motor could be another kind of DC motor such as a two phase or three phase BLDC motor, a universal motor, a stepper motor, a servo motor or an AC motor, such as a shaded-pole motor, induction motor or universal motor, which is able to be directly powered by the decreased AC voltage output from the voltage decreasing unit.
- In the description and claims of the present application, each of the verbs “comprise”, “include”, “contain” and “have”, and variations thereof, are used in an inclusive sense, to specify the presence of the stated item but not to exclude the presence of additional items.
Claims (18)
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201010138043 | 2010-03-26 | ||
CN201010138043.8 | 2010-03-26 | ||
CN201010138043 | 2010-03-26 | ||
CN201010270600 | 2010-08-24 | ||
CN201010270600.1 | 2010-08-24 | ||
CN2010102706001A CN102201742A (en) | 2010-03-26 | 2010-08-24 | Power supply circuit, motor device and fan |
Publications (2)
Publication Number | Publication Date |
---|---|
US20110234128A1 true US20110234128A1 (en) | 2011-09-29 |
US8754606B2 US8754606B2 (en) | 2014-06-17 |
Family
ID=44655607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/072,178 Expired - Fee Related US8754606B2 (en) | 2010-03-26 | 2011-03-25 | Power supply circuit and motor device |
Country Status (4)
Country | Link |
---|---|
US (1) | US8754606B2 (en) |
JP (1) | JP5933185B2 (en) |
CN (1) | CN102201742A (en) |
DE (1) | DE102011014826A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103607163A (en) * | 2013-12-11 | 2014-02-26 | 深圳市联翔电机有限公司 | Cooling fan |
EP3226658A4 (en) * | 2014-11-24 | 2017-12-27 | Shunhua Li | Ballasted led lamp drive power supply with variable power and energy saving |
CN112600478A (en) * | 2020-12-14 | 2021-04-02 | 广东交通职业技术学院 | Drive control system and method of high-frequency injection permanent magnet synchronous motor |
US11277082B2 (en) * | 2019-11-05 | 2022-03-15 | Hamilton Sundstrand Corporation | Multipurpose brake |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9614431B2 (en) * | 2010-03-26 | 2017-04-04 | Johnson Electric S.A. | Control circuit and motor device |
US9887620B2 (en) * | 2015-06-05 | 2018-02-06 | Dong-Sheng Li | Power converter |
CN105470969B (en) * | 2016-01-18 | 2018-09-04 | 战子英 | Capacitive ac voltage regulator, power supply unit and alternating voltage adjusting method |
CN106499653A (en) * | 2016-10-26 | 2017-03-15 | 覃良 | A kind of electric fan speed-regulating switch |
CN107525233A (en) * | 2017-08-15 | 2017-12-29 | 青岛海尔空调器有限总公司 | The control method and system of the outer blower fan of air-conditioning |
CN107514707B (en) * | 2017-08-15 | 2020-11-03 | 青岛海尔空调器有限总公司 | Air conditioner outdoor unit and air conditioner comprising same |
CN107514705B (en) * | 2017-08-15 | 2020-11-03 | 青岛海尔空调器有限总公司 | Air conditioner outdoor unit and air conditioner comprising same |
CN108880270B (en) * | 2018-09-19 | 2024-05-03 | 深圳线易微电子有限公司 | Power converter control circuit |
CN112039324A (en) * | 2020-07-31 | 2020-12-04 | 珠海格力电器股份有限公司 | Overvoltage protection circuit, method and device, power supply equipment and computer readable medium |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4751451A (en) * | 1984-10-04 | 1988-06-14 | Vent-Axia Limited | Fan motor control system |
US6608405B1 (en) * | 1997-06-06 | 2003-08-19 | Manvel Zakharian | Method of obtaining the adjustable capacitor |
US7102326B1 (en) * | 2005-08-08 | 2006-09-05 | Fego Precision Industrial Co., Ltd. | Motor speed variator and a driving method thereof |
US20110235218A1 (en) * | 2010-03-26 | 2011-09-29 | En Hui Wang | Control circuit and motor device |
US20130003252A1 (en) * | 2005-04-07 | 2013-01-03 | American Radionic Company, Inc. | Capacitor for multiple replacement applications |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1350176A (en) * | 1972-07-21 | 1974-04-18 | Okikiolu G O | Capacitor and resistor arrangements for selected power output units |
JPS56139081A (en) * | 1980-03-31 | 1981-10-30 | Seiko Epson Corp | Capacitor voltage dropping circuit |
US4525651A (en) * | 1982-05-18 | 1985-06-25 | General Electric Company | Capacitively ballasted low voltage incandescent lamp |
JP2847425B2 (en) * | 1990-06-25 | 1999-01-20 | 国華 王 | Capacitor AC step-down circuit |
IT1303625B1 (en) | 1998-07-24 | 2000-11-15 | Gruppi Pinasco S R L | VARIABLE SPEED LIMITER FOR MOTOR VEHICLES WITH ELECTRONIC IGNITION. |
FR2851118B1 (en) * | 2003-02-12 | 2005-09-30 | Fd Eclairage Architectural | VERY LOW VOLTAGE LAMP POWER SUPPLY INSTALLATION |
CN2643542Y (en) * | 2003-07-11 | 2004-09-22 | 元山科技工业股份有限公司 | Power source control circuit device for DC brushless fan motor |
JP2007202274A (en) * | 2006-01-25 | 2007-08-09 | Rcs:Kk | Small-capacity power supply |
CN101188400A (en) * | 2007-12-13 | 2008-05-28 | 佛山市顺德区泛仕达机电有限公司 | A novel AC electromotor voltage reduction speed-adjusting circuit |
-
2010
- 2010-08-24 CN CN2010102706001A patent/CN102201742A/en active Pending
-
2011
- 2011-03-23 DE DE102011014826A patent/DE102011014826A1/en not_active Withdrawn
- 2011-03-25 US US13/072,178 patent/US8754606B2/en not_active Expired - Fee Related
- 2011-03-28 JP JP2011089580A patent/JP5933185B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4751451A (en) * | 1984-10-04 | 1988-06-14 | Vent-Axia Limited | Fan motor control system |
US6608405B1 (en) * | 1997-06-06 | 2003-08-19 | Manvel Zakharian | Method of obtaining the adjustable capacitor |
US20130003252A1 (en) * | 2005-04-07 | 2013-01-03 | American Radionic Company, Inc. | Capacitor for multiple replacement applications |
US7102326B1 (en) * | 2005-08-08 | 2006-09-05 | Fego Precision Industrial Co., Ltd. | Motor speed variator and a driving method thereof |
US20110235218A1 (en) * | 2010-03-26 | 2011-09-29 | En Hui Wang | Control circuit and motor device |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103607163A (en) * | 2013-12-11 | 2014-02-26 | 深圳市联翔电机有限公司 | Cooling fan |
EP3226658A4 (en) * | 2014-11-24 | 2017-12-27 | Shunhua Li | Ballasted led lamp drive power supply with variable power and energy saving |
US11277082B2 (en) * | 2019-11-05 | 2022-03-15 | Hamilton Sundstrand Corporation | Multipurpose brake |
CN112600478A (en) * | 2020-12-14 | 2021-04-02 | 广东交通职业技术学院 | Drive control system and method of high-frequency injection permanent magnet synchronous motor |
Also Published As
Publication number | Publication date |
---|---|
CN102201742A (en) | 2011-09-28 |
DE102011014826A1 (en) | 2012-04-19 |
JP2011211898A (en) | 2011-10-20 |
US8754606B2 (en) | 2014-06-17 |
JP5933185B2 (en) | 2016-06-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8754606B2 (en) | Power supply circuit and motor device | |
US9166444B2 (en) | Control circuit and motor device | |
KR100471087B1 (en) | Power supply device and control method thereof | |
US7688011B2 (en) | Control circuit for an electronically commutated motor | |
US20040051496A1 (en) | Method and apparatus for controlling electronically commutated motor operating characteristics | |
JP2016039778A5 (en) | ||
JP2010284029A (en) | Power supply circuit for driving inverter | |
US9614431B2 (en) | Control circuit and motor device | |
US20220149760A1 (en) | Alternating current power tool and startup method thereof | |
KR20040041201A (en) | power supply apparatus for motor and controlling method thereof | |
WO2022237307A1 (en) | Power tool and control method therefor | |
CN102201743A (en) | Motor device, fan and power circuit | |
US7042182B2 (en) | Electronically commutated motor operable directly from AC power network | |
KR101680030B1 (en) | Control method and control system of sensorless brushless DC motor for small pan | |
US20170104427A1 (en) | Electronic device and circuit | |
CN101771319B (en) | Brushless DC motor and drive unit thereof | |
KR20160097645A (en) | Brushless direct current motor type inverter driving circuit | |
CN101617463A (en) | Asynchronous machine control | |
US11646691B2 (en) | Power tool | |
CN100461614C (en) | Rotating-speed control circuit of fan motor and voltage adjusting assembly | |
CN212343677U (en) | Single-phase motor driving circuit | |
JP4131944B2 (en) | Motor device with built-in inverter circuit | |
JP3661305B2 (en) | DC power supply | |
KR100702224B1 (en) | static electrical switch for single phase motor | |
CN113922707A (en) | Single-phase motor driving circuit and driving method thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: JOHNSON ELECTRIC S.A., SWITZERLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:XIN, FEI;WANG, EN HUI;SUN, CHI PING;AND OTHERS;REEL/FRAME:026024/0925 Effective date: 20110310 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.) |
|
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.) |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20180617 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20180617 |